IIRC at 2500 rpm mine runs about 67 mph uphills and over 72 downhills. Have you checked your ATF level? Mine was over a quart low due to a leaky O-ring seal around the electrical plug connector and was experiencing similiar issues.

__________________
Scott C.

2006 E320 CDI (120k miles)
FOR SALE: 1998 E300 Turbo Diesel - Black w/Tan Leather - Euro delivery (236k miles)